Shepherd’s Purse (Capsella bursa-pastoris)

Nomenclature & Taxonomic Classification

• Botanical Binomial: Capsella bursa-pastoris (L.) Medik.
• Family: Brassicaceae
• Common Name(s): Shepherd’s Purse, Witch’s Pouches, Pick-Purse
• Parts Used: Fresh or carefully dried aerial parts.

Botanical Description, Habitat & Sustainability

• Physical Description: * Growth Habit: Annual or biennial herbaceous weed.
  • Morphology: Basal rosette of deeply pinnatifid leaves giving rise to an erect stem (10–50 cm) with small, white, 4-petaled flowers. The highly distinctive diagnostic feature is its flat, triangular, heart-shaped, purse-like seed pods (silicles).
• Habitat & Cultivation: Cosmopolitan weed distributed globally. Found abundantly in agricultural fields, garden borders, waste places, and disturbed soils.
• Sustainability Status: Secure / Extremely abundant weed worldwide.

Energetics & Traditional Actions

• Western Tissue States: Corrects Relaxation/Tissue Laxity (premier, powerful systemic styptic/hemostatic for capillary beds).
• Traditional Vector:
  • Ayurveda: Rasa (Taste): Kashaya (Astringent), Tikta (Bitter) | Virya (Energy): Shita (Cooling) | Vipaka (Post-Digestive Effect): Katu | Dosha Modulation: Decreases Pitta and Kapha; can elevate Vata over time due to high dryness.
  • Traditional Chinese Medicine: Temperature: Neutral to Cool | Taste: Sweet, Bland, Astringent | Organ Meridians Entered: Liver, Bladder, Spleen.
• Historical Folk Use: Regarded since the Middle Ages as the absolute premier herbal first-aid treatment to stop acute hemorrhages, including severe menorrhagia, postpartum bleeding, hematuria, and open epistaxis (nosebleeds).

Phytochemistry & Pharmacological Dynamics

• Primary Phytochemicals: Flavonoids (rutin, diosmin), organic acids, biogenic amines (tyramine, choline, histamine), glucosinolates, and condensed tannins.
• Mechanism of Action: > Shepherd’s Purse acts as a targeted peripheral hemostatic. While its high tannin content provides localized astringency to visible wounds, its systemic mechanism involves biogenic amines and flavonoids that stimulate smooth muscle contraction within peripheral blood vessels and the uterine wall. This causes vasoconstriction of leaking capillary beds, rapidly accelerating local clotting sequences without altering general systemic coagulation cascades.

Clinical Applications & Indications

• Primary Indications: Menorrhagia (excessively heavy menstrual bleeding), metrorrhagia (intermenstrual bleeding), acute postpartum hemorrhage, and hematuria (blood in urine).
• Secondary Indications: Acute epistaxis, bleeding hemorrhoids, and topically on open, minor bleeding lacerations.
• Modern Clinical Evidence: Clinical usage within midwifery and herbal gynecology firmly establishes its ability to reduce excessive menstrual blood volume and check sudden pelvic capillary leaking patterns safely.

Preparation, Dosing & Extraction Matrix

• Optimal Menstruum & Extraction Guidelines: CRITICAL QUALITY BOUNDARY: The active anti-hemorrhagic components degrade dramatically during slow drying or long storage. Dried material from commercial bulk bins is often entirely clinically inert. A tincture made from the fresh plant (using a low-to-mid proof menstruum, 25–40% EtOH) is mandatory for clinical reliability.

Standard Dosage Parameters

Safety Profile, Contraindications & Drug Interactions

• Contraindications: Use caution during early-stage pregnancy due to the plant’s mild uterine-stimulating capabilities (unless indicated for active labor hemorrhage management). Avoid in individuals with active deep vein thrombosis (DVT) or major hypercoagulation disorders.
• Side Effects & Toxicity Thresholds: Exceptionally non-toxic in fresh plant form; large doses may cause mild palpitations due to trace tyramine content.
• Pharmaceutical Cross-Interactions: * Enzyme Alterations: Non-significant.
  • Additive Pathways: May interact theoretically with pharmaceutical anticoagulants (e.g., Warfarin, Coumadin).

References

1. Felter, H.W., & Lloyd, J.U. King’s American Dispensatory.
2. Grieve, M. A Modern Herbal.
3. Kuroda, K., et al. (1969). “Studies on the hemostatic principle of Capsella bursa-pastoris.” Archives Internationales de Pharmacodynamie et de Thérapie.